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Old January 29th, 2008, 05:07 PM   #1
ricegt24
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Default 4wd isn't working

I have an 02 silverado 1500, i got stuck in the mud and my 4wd went out. So i did some trouble shooting and i replaced my 4wd actuator. I also check my pushbutton switches on my dash and they have plenty of volts and work fine. I can here my transfer case and my actuator make noise when i shift into 4hi or 4lo. I also put my truck into 2wd and i rotated my front drive shaft. I put it into 4hi and 4lo and it did not move. So it will engage but still my two front tires will not spin??? what could it be????
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Old January 29th, 2008, 05:10 PM   #2
blownexploder94
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vaccum line on the front diff. broke/ off / or cracked
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Old January 29th, 2008, 05:54 PM   #3
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Sounds like your front axle is not engaging, is that the actuator you replaced and hear working?

It should have a 4 wire connector, brown is power from the 4wd fuse and a switch on the transfer case grounds the light blue wire to engage 4wd. You could put you test light between those to and it should light when the transfer case is in 4wd. If it does than either a bad front actuator or something is broke in the front.
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Old January 29th, 2008, 07:50 PM   #4
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Quote:
Originally Posted by blownexploder94 View Post
vaccum line on the front diff. broke/ off / or cracked
not on an 02.

its more than likely the front engagement mechanism. a couple bolts and your done.
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Old January 29th, 2008, 09:35 PM   #5
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unscrew the actuator but leave it wired up. put it in 4wd and see if the actuator moves. if it does then thats not the problem. put it back in 2wd and put a socket extension inside the opening for the actuator and push inwards while turning the front driveshaft you should hear and feel a click that means the front end is locking in. if you either can't push it in at all, or you push it in and nothing happens then you have an internal problem with the front axle itself. i've seen it a few times where the actual shift fork gets binded up inside the diff and won't move, or the mini shafts that connect the spiders to the cv's break.
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